So not counting your time of 24/7 support and electric and the occasional hardware failure. I'd figure the monthly expense of about 600 (loan) and 1k for the t-1. (guesstimate, i know you can get them much cheaper). If you keep your existing customers or at least keep a consistent drop/add ratio, the you could be free and clear of the load in under 2 years.
That is like 4 lifetimes on the internet
